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If copy or paste is failing on YouTube in Firefox, first check which direction is affected and whether the problem is limited to YouTube. For text that will not paste into a YouTube comment field, one targeted check is Firefox’s dom.event.clipboardevents.enabled preference—but it is a secondary-source suggestion, not a guaranteed fix. Use the steps below in order, starting with simple tests before changing browser settings.
First, find out what is failing
Copying text out of a YouTube page and pasting text into a YouTube field are separate actions. Test each one, then compare YouTube with another site:
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- Select text on YouTube, copy it, and paste it into another application or a plain text field.
- Copy text from another application and try to paste it into a YouTube comment or other text field.
- Repeat copy and paste on a different website.
If only pasting into YouTube fails, use the preference check below. If the issue also occurs elsewhere, skip that targeted change and test Firefox add-ons instead. These tests help narrow the scope; they do not identify the cause by themselves.
If paste into YouTube fails, check this Firefox preference
BrowserHow’s guide for this specific symptom suggests checking dom.event.clipboardevents.enabled. This is not a Mozilla-endorsed universal fix, so change it only when paste into a YouTube field is the problem.
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- In Firefox’s address bar, enter
about:configand press Enter. - Accept the warning to continue to Advanced Preferences.
- Search for
dom.event.clipboardevents.enabled. - If the value is
false, toggle it totrue. If it is alreadytrue, leave it as is. - Return to YouTube and try pasting again.
A historical Mozilla Bugzilla report records a similar complaint about pasting into YouTube comments and notes that the suggested setting could cause problems on other sites. That report does not establish a current, general Firefox defect. If changing the value makes another site behave incorrectly, return to about:config and restore the previous value.
Test whether an add-on is interfering
If copy and paste fail beyond YouTube, or the preference check does not help, use Firefox Troubleshoot Mode. Mozilla documents it as a way to test whether add-ons or other customizations are involved.
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- Open Firefox’s menu and choose Help, then Troubleshoot Mode (in some Firefox versions, the menu wording may differ slightly).
- Choose Restart when prompted, then confirm starting in Troubleshoot Mode.
- Test copy and paste on YouTube and another site.
- If the problem disappears, restart Firefox normally. Disable or remove add-ons selectively, testing after each change, until you identify the one associated with the problem.
Troubleshoot Mode is a diagnostic step. If it does not change the behavior, an add-on is less likely to be responsible.
Try YouTube’s general browser troubleshooting steps
YouTube’s help guidance for browser problems recommends updating the browser, clearing cache and cookies, and checking whether extensions affect YouTube. These are general maintenance and isolation steps, not clipboard-specific fixes.
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- Update Firefox: install available browser updates, then retry the same copy-and-paste tests.
- Clear cache and cookies: this can sign you out of sites or remove saved site data, so be prepared to sign in again.
- Test a private window: YouTube recommends testing with extensions disabled for YouTube problems. If the issue changes, investigate extensions; private-window behavior can depend on which extensions are allowed there.
What Firefox clipboard permissions do—and do not—control
Do not look for Chromium-style web permissions named clipboard-read or clipboard-write and expect to grant them in Firefox. MDN notes that Firefox does not support those Permissions API entries in the way Chromium-based browsers do.
Clipboard events and web clipboard APIs are also not the same as ordinary keyboard shortcuts. A page can handle cut, copy, or paste events, and browser security rules can restrict clipboard API behavior. That technical distinction does not mean a normal keyboard paste into a text field is deprecated or disabled: MDN’s note that document.execCommand() clipboard commands are deprecated concerns a web-development method, not the user’s Ctrl+V or Command+V shortcut.
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If the problem remains, collect Firefox details
Before asking for help, record whether the failure is copying, pasting, or both; whether it happens only on YouTube; and what happened in Troubleshoot Mode. Open about:support to view Firefox’s Troubleshooting Information, including the browser version and environment details. Mozilla’s support guidance also describes Troubleshoot Mode and Refresh Firefox, but a refresh is a broader reset and is best left until simpler checks have failed.
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